121400736 has 48 divisors (see below), whose sum is σ = 323916768. Its totient is φ = 39801600.

The previous prime is 121400731. The next prime is 121400753. The reversal of 121400736 is 637004121.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (121400731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4510 + ... + 16221.

It is an arithmetic number, because the mean of its divisors is an integer number (6748266).

Almost surely, 2^121400736 is an apocalyptic number.

121400736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121400736 is an abundant number, since it is smaller than the sum of its proper divisors (202516032).

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

121400736 is a wasteful number, since it uses less digits than its factorization.

121400736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20805 (or 20797 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 121400736 is about 11018.2002160062. The cubic root of 121400736 is about 495.1541688954.

Adding to 121400736 its reverse (637004121), we get a palindrome (758404857).

The spelling of 121400736 in words is "one hundred twenty-one million, four hundred thousand, seven hundred thirty-six".