1540990697472 has 456 divisors, whose sum is σ = 4891622875776. Its totient is φ = 483108323328.

The previous prime is 1540990697471. The next prime is 1540990697503. The reversal of 1540990697472 is 2747960990451.

1540990697472 is a `hidden beast` number, since 1 + 5 + 409 + 90 + 6 + 9 + 74 + 72 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540990697471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1082916153 + ... + 1082917575.

Almost surely, 2^{1540990697472} is an apocalyptic number.

1540990697472 is a gapful number since it is divisible by the number (12) 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 1540990697472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2445811437888).

1540990697472 is an abundant number, since it is smaller than the sum of its proper divisors (3350632178304).

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

1540990697472 is an frugal number, since it uses more digits than its factorization.

1540990697472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491 (or 1445 counting only the distinct ones).

The product of its (nonzero) digits is 34292160, while the sum is 63.

The spelling of 1540990697472 in words is "one trillion, five hundred forty billion, nine hundred ninety million, six hundred ninety-seven thousand, four hundred seventy-two".