1491494400 has 540 divisors, whose sum is σ = 5921831916. Its totient is φ = 358195200.

The previous prime is 1491494399. The next prime is 1491494401. The reversal of 1491494400 is 44941941.

It is an interprime number because it is at equal distance from previous prime (1491494399) and next prime (1491494401).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491494401) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 13939147 + ... + 13939253.

Almost surely, 2^1491494400 is an apocalyptic number.

1491494400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1491494400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2960915958).

1491494400 is an abundant number, since it is smaller than the sum of its proper divisors (4430337516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1491494400 is a wasteful number, since it uses less digits than its factorization.

1491494400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1491494400 is about 38619.8705331854. The cubic root of 1491494400 is about 1142.5464774636.

The spelling of 1491494400 in words is "one billion, four hundred ninety-one million, four hundred ninety-four thousand, four hundred".