1401477640 has 16 divisors (see below), whose sum is σ = 3153324780. Its totient is φ = 560591040.

The previous prime is 1401477593. The next prime is 1401477643. The reversal of 1401477640 is 467741041.

It can be written as a sum of positive squares in 2 ways, for example, as 1348799076 + 52678564 = 36726^2 + 7258^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1401477596 and 1401477605.

It is not an unprimeable number, because it can be changed into a prime (1401477643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17518431 + ... + 17518510.

Almost surely, 2^1401477640 is an apocalyptic number.

1401477640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1401477640 is an abundant number, since it is smaller than the sum of its proper divisors (1751847140).

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

1401477640 is a wasteful number, since it uses less digits than its factorization.

1401477640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35036952 (or 35036948 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 1401477640 is about 37436.3144553520. The cubic root of 1401477640 is about 1119.0823797732.

The spelling of 1401477640 in words is "one billion, four hundred one million, four hundred seventy-seven thousand, six hundred forty".